Incandescent-lamp socket.



No. 781,226. PATENTEDJAN. 31, 1905.

- i W. H. PERKINS. I

INGANDESGENT LAMP SOCKET.

APPLICATION FILED our. 31,1904.

.UNITED STATES Patented January 31, 1905.

PATE T OFFICE.

WALTER H. PERKINS, or WATERBURY, CONNEOTICUT,'ASSIGNOR TO WATERBURY MFG. 00., OF WATERBURY, CONNECTICUT, A CORPORA- TION.

lNCANDESCENT-LAMP SOCKET.

SPECIFICATION forming part of Letters Patent No. 781,226, dated January 31, 1905.

' Application filed October 31, I904=. Serial No. 230,762.

T0 all whom it may concern:

Be it known that I, WALTER H. PERKINS, of

Waterbury, in the county of New Haven and ings constitute part of this specification, and

represent, in v a Figure 1, a view in elevation of an incandescent-lamp socket constructed in accordance with my invention; Fig 2, a View thereof in transverse section on the line a b of Fig. 1; Fig. 3, a detached view in elevation of the cap; Fig. 4, a corresponding view of the shell.

My invention relates to an improvement in incandescent-lamp sockets of that kind in which a bayonet-joint lock is employed for securing the cap and shell of the socket together, the object being to produce a simple and compact device constructed with particular reference to the automatic locking of the cap and shell against rotation when the screws carried by the shell have reached the limit of their movement in the horizontal portions of the bayonet-slots in the cap. Y

With these ends in View my invention consists in an incandescent-lamp socket having certain details of construction, as will be hereinafter described, and pointed out in the claim. In carrying out my invention as herein shown the sheet-metal cap 2, which may be ofany approved construction, has its depending flange 3 formed with two bayonet-joint slots 4 of, ordinary form. These slots receive two screws 5, located opposite each other and mounted near the upper edge of a sheet-metalshell 6 of any approved construction. In the drawings only one of these screws is shown. The said shell and cap are coupled together by entering the upper edge of the shell into the flange 3 of the cap, with the shanks of the screws 5 registered with the vertical portions of the bayonet-slots 4. The shell and cap are then pushed together, after which theyare screws reach the limit of their movement in the horizontal portions of the slots. Now to prevent them from being accidentally rotated with respect to each other they are automatically locked. against such rotation by the provision of the shell with a struck-up looking boss 7 located between its key-slot 8 and a screw-hole 9, receiving one of the screws 5. The metal near the edge of the slot 8 is of course yielding, whereby the boss 7 is given a spring action. The outer edge of the said boss is made straight for engaging with the longer outer wall of the vertical portion of the complementary bayonet-joint slot t in the cap. When the cap and shell are first put together, the portion 10 of the cap rides over the boss and springs the same inward. Then when the shell and cap are rotated with respect to each other the boss is gradually excap is rotated, during which the boss passes under the portion 10 of the flange 3. Then when the screws are brought into registration with the vertical portions of the bayonetslots the cap and shell may be drawn apart.

Although as herein shown the locking-boss 7 is produced by striking up the metal of the shell 6 from the inner face thereof, it is apparentthat a locking-boss might be made independent of the shell and soldered or otherwise secured to the outer face thereof in right position thereon. I would therefore have it understood that I do not limit myself to theexact construction shown, but hold myself at liberty to make such variations therefrom as fairly fall within the spirit and scope of my invention.

Having fully described my invention, what Iclaim as new, and desire to secure by Letters Patent, is

In an incandescent-lamp socket, the combination with a sheet-metal cap formed with one or more bayonet-joint slots, of a sheet-metal shell furnished With a screw for coaction With each of the said slots, and a yielding lockingboss arranged to engage with a verticalwail of one of the said slots for holding the cap and shell in their rotated and locked positions.

In testimony whereof I have signed this specification 1n the presence of two subscrib- 10 mg witnesses.

\VALTER H. PERKINS.

\Vitnesses:

A. (J. BECKER, J. N. DUCI-IETTE. 

